Präsidialkanzlei and LDO (Leistungsgemeinschaft der Deutschen Ordenshersteller) numbers.

In the Third Reich, many awards and medals were produced by various manufacturers. These medals and awards were often presented in large numbers, and it was important to ensure the quality and authenticity of the medals. Therefore, the manufacturers were assigned unique numbers by the Präsidialkanzlei (PkZ). These numbers served various purposes such as quality control, traceability and uniformity. The latter was especially important so that the medals from different manufacturers looked consistent, which was of course important for the recognition of the award. In 1942, the Leistungsgemeinschaft der Deutschen Ordenshersteller (LDO) was founded. The collaboration was intended to pool resources and minimize bottlenecks in weapons production.

Medals often contain small differences that are visible to expert collectors.